3Com 4007, Implementation Manual, Page: 183 / 684

STP Bridge and Port Parameters 183
STP Bridge and Port
Parameters
On any switching module, if you want to use STP, you must first enable it
on a bridge-wide basis and then on a per-port basis. This section
describes the parameters that you can modify and their implications for
your network.
On Layer 2 Switching Modules, even if you do not want to use STP, you
may want to configure the
agingOnly
option that exists in the
bridge
spanningtree stpState
command — this setting relates to the
module’s ability to accelerate address aging in certain circumstances. See
“MAC Address Table Design” and “Address Aging” in this chapter for
more information.
Bridge-wide STP
Parameters
You can modify these STP bridge-wide parameter at any times:
■
Bridge-wide STP state
■
Bridge priority
■
Bridge maximum age
■
Bridge hello time
■
STP group address
See the Switch 4007 Command Reference Guide for value ranges and
defaults for these parameters, as well as definitions of fields in the
displays.
Bridge-Wide STP State
You can set the bridge-wide STP state to one of these options:
Default
■
Enabled — This setting allows any bridge port on the module to run
STP, as long as it too has STP enabled. The bridge-wide STP state is
enabled by default on all modules.
■
Disabled — The module operates as a store-and-forward bridge, but
cannot participate in the STP algorithm. Thus, the STP settings on
individual bridge ports have no effect either.
■
Aging Only (Layer 2 Switching Modules only) — STP is disabled
with this setting, however an accelerated address aging process will
occur when the module detects a port link down event. (This is a
process that also occurs when STP is enabled.)
To understand how the bridge-wide STP state options affect address
aging, see “Address Aging” in this chapter.